This section of a 17 May 2006 article from an internal NSA newsletter makes it clear that Japanese foreign policy and trade activities are surveillance targets for the agency: see the Intercept article Japan Made Secret Deals With The NSA That Expanded Global Surveillance, 24 April 2017.

This 13 July 2007 article from the internal NSA newsletter SIDToday describes how the agency surveilled the Japanese delegation at the 59th annual meeting of the International Whaling Commission, with the help of their New Zealand partner: see the Intercept article Japan Made Secret Deals With The NSA That Expanded Global Surveillance, 24 April 2017. […]

This 19 July 2006 article from the internal NSA newsletter Foreign Affairs digest explains the ramifications of the Soviet attack on Korean Airlines flight 007 in 1983 for US-Japanese intelligence cooperation: see the Intercept article Japan Made Secret Deals With The NSA That Expanded Global Surveillance, 24 April 2017.

This undated NSA protocol note provides a short briefing for a visit to the agency’s Deputy Director of Foreign Affairs by his Japanese counterpart, due to happen sometime after January 2013: see the Intercept article The Untold Story of Japan’s Secret Spy Agency, 19 May 2018.

This internal assessment from the NSA dated 14 January 2013 analyses Japan’s progress towards its cyber defense goals and domestic barriers to progress ahead of a planned US-Japanese Memorandum of Understanding due to be signed that year: see the Intercept article The Untold Story of Japan’s Secret Spy Agency, 19 May 2018.

SECRET//SI//NOFORN
TOPIC: (S//SI//REL TO USA, JPN) Current State of and Proposed Future Cooperation
with Japan on SIGINT-enabled Cyber Defense and the development of a Japanese
National Cyber ...

This NSA classification guide, dated 21 November 2011, covers signals intelligence material that as to be kept secret for more than the standard 60 years: see the Der Spiegel article The NSA in Germany: Snowden’s Documents Available for Download, 18 June 2014.

This undated internal NSA document illustrates the degrees of cooperation in the agency’s relationships with different foreign powers. “Tier A” and “Tier B” are elsewhere referred to as Second and Third Parties: see the book No Place To Hide, 13 May 2014.

This excerpt from a 2006 NSA memo written by the global resources manager of the International Security Issues (ISI) mission underlines the importance of data on energy resources, production and international investment to the agency: see the book No Place To Hide, 13 May 2014.

﻿Page 138
(U) NSA Washington Mission
(U) Regional
(TS//SI) ISI is responsible for 13 individual nation states in three continents. One
significant tie that binds all these countries togethe...

An extract from a 2009 memo from the technical director of NSA Mission Operations, describing improvements at Misawa Security Operations Center (MSOC), the agency’s collection point in Misawa, Japan: see the book No Place To Hide, 13 May 2014.

﻿Page 98
Future Plans (U)
(TS//SI//REL) In the future, MSOC hopes to expand the number of WORDGOPHER platforms to
enable demodulation of thousands of additional low-rate carriers.
These
...

"DISTANTFOCUS," a system mounted on Predator drones in the global war on terrorism, brings "the dawn of a new era" for signals intelligence and precision geolocation. Operators at the NSA headquarters have been remotely receiving encrypted real-time audio and geolocation data from U.S. Central Command's area of responsibility since December 2004.

The Korea Issue Management Team held a rock drill in Hawaii designed to test the cryptologic system's capabilities in a war on the Korean peninsula. The scenario was a North Korean attack on South Korea.

This 19 November 2008 article from the NSA internal newsletter SIDToday presents an interview with the head of US Special Liaison Activity Japan (SUSLAJ), who describes Japan’s reluctance to participate in multinational SIGINT fora and historic agency operations in Pakistan and the Philippines: see the Intercept article Japan Made Secret Deals With The NSA That […]

DYNAMIC PAGE -- HIGHEST POSSIBLE CLASSIFICATION IS
TOP SECRET // SI / TK // REL TO USA AUS CAN GBR NZL
(S//SI//REL) What's NSA's Reputation Among Third Parties? What Are the Japanese Like as
...

This internal briefing dated 2 January 2013 provides talking points for the NSA Director on restoring Japanese participation in the CROSSFIRE programme, which had stopped in 2009: see the Intercept article Japan Made Secret Deals With The NSA That Expanded Global Surveillance, 24 April 2017.

SECRET//COMINT//NOFORN
(S//REL TO USA, FVEY) Topic: NSA High Frequency (HF) Collaboration efforts with Japan
(S//REL TO USA, FVEY) Background: For many years, NSA collaborated with the DFS on...

This internal briefing dated 29 January 2013 provides talking points for the NSA Director on improving cooperation with Japan in the cyber realm : see the Intercept article Japan Made Secret Deals With The NSA That Expanded Global Surveillance, 24 April 2017.

SECRET//SI//NOFORN
(S//REL TO USA, JPN) Topic: NSA Assistance to Japanese Directorate for SIGINT in
Developing Capabilities to Provide SIGINT Support to CND.
(U) Background:
(S//NF) The J...

This 24 February 2005 article from the internal NSA newsletter Foreign Affairs Digest describes third party cooperation and interoperability in High Frequency Direction-Finding (HFDF): see the Intercept article Japan Made Secret Deals With The NSA That Expanded Global Surveillance, 24 April 2017.

This 23 October 2010 article from the internal NSA newsletter FAD Digest describes how US-Japanese intelligence cooperation has begun to operate more openly: see the Intercept article Japan Made Secret Deals With The NSA That Expanded Global Surveillance, 24 April 2017.

This presentation from the 2010 SIGDEV Conference describes the contribution made by GCHQ to the development of Quantum techniques: see the Intercept article How the NSA Plans to Infect ‘Millions’ of Computers with Malware, 12 March 2014.

﻿TOP SECRET//COMINT//REL TO USA, FVEY//20320108
TOP SECRET//COMINT//REL TO USA, FVEY//20320108
SIGDEV: Discovery in the Cyber Ag>
TOP SECRET//COMINT//REL TO USA, FVEY//20320108
(U) Clas...

Japan’s Directorate for SIGNIT, or DFS, found the replacement for a signal that benefited “many organizations” in the U.S. intelligence community but disappeared in 2002 or 2003. To honor this discovery, the NSA allowed DFS to name the new signal.

Rock Drill 5 tested the cryptologic capability for an allied counteroffensive into North Korea. It was the first exercise of its type to be held with a third-party partner, South Korea's Defense Security Agency.

The NSA opened an engineering support facility at Yokota Air Base in Japan. The $6.6 million facility, paid for almost entirely by the Japanese government, produces and repairs antennas for NSA operations across the globe.

A joint US Navy and NSA report, prepared three months after a US spy plane was forced to crash land in China, assesses the degree to which surveillance secrets were compromised: see the Intercept article Burn After Reading: Snowden Documents Reveal Scope of Secrets Exposed to China in 2001 Spy Plane Incident, 10 April 2017. […]

TOP SECRET//COMINT//NOFORN//X1
EP-3E Collision:
Cryptologic Damage Assessment
and Incident Review
Final Report
Prepared by the
EP-3 Cryptologic Assessment Team
July 2001
Classifie...

This 2010 NSA presentation describes Project Camberdada, an attempt to subvert popular antivirus software by means of surveilling email traffic: see the Intercept article Popular Security Software Came Under Relentless NSA and GCHQ Attacks, 22 June 2015.

This 23 March 2009 article from the internal NSA newsletter SIDToday describes technological advances at the NSA facility in Misawa, Japan and progress towards the Agency’s goal of “collecting it all”: see the Intercept article Japan Made Secret Deals With The NSA That Expanded Global Surveillance, 24 April 2017.